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1 When the burner of a stovetop is very hot, it is a source of heat energy. 2  Anything placed onto the stovetop and warmed, whether a pot of tea or a skillet for frying eggs, also become sources of heat energy. 3  Automobile fuels such as gasoline are sources of heat energy, as is the hot engine of a racecar or a school bus.
Most ofEarthâs heat energy comes from the Sun by the process ofradiation. Energy from the Sun enters Earthâs atmosphereand some gets trapped. This trapped energy warms theplanet. In this chapter you will learn that ocean currents,wind, and weather are all related to heat energy at Earthâssurface.